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一、概述南岭隧道生潮垄地段DK1935+295～+755石灰溶岩发育,地质最为复杂的地段。生潮垄溶蚀洼地存在有NNE的压性断层和NWW向张性断裂相互切割,岩石节理裂隙发育,为岩溶发育创造了条件。一般溶洞成串珠状,在构造复合地段溶洞宽大。岩溶地貌极为发育,大量的漏斗、落水洞、岩溶泉、溶蚀小洼地罗布其中。下连溪海横贯洼地,河水径流条件较好,枯水期流量21937m~3/d,丰水期为枯水期4～4倍。生潮垄位于南岭山脉长江,珠江之分水岭,雨量充沛,且第四世纪以来又处于缓慢持续上升阶段,有利于浅屋岩溶发育。由于地下水补绘,径流排泄途径较短,水流交替迅速、浅层岩溶水丰
First, an overview Nanling tunnel tide ridge section DK1935 +295 ~ +755 limestone development, the most complex geological section. There are NNE compressional faults and NWW trending tensional faults in tidal wetland depressions, which cut each other and the rock joints and fractures develop, creating conditions for karst development. Beads generally cave, in the construction of large sections of cave. Karst topography is extremely developed, a large number of funnels, sinkholes, karst springs, dissolution of small depressions Rob among them. Xiaolian Creek across the depression, river runoff conditions are good, the flow of 21937m 3 / d dry season, dry season 4 to 4 times the dry season. Tide ridge is located in the Nanling Mountains, the Pearl River, the Pearl River watershed, abundant rainfall, and since the fourth century has continued to rise slowly, is conducive to shallow karst development. Because of groundwater replenishment, runoff drainage is short and water flow alternates rapidly. Shallow karst water abundance